J-Link Device Used

This setup uses low-cost J-Link OB compatible debug probes (SWD).

Installation

1. Install J-Link package

Download Linux .deb package from: https://www.segger.com/downloads/jlink/

2. Install Python runtime helpers

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sudo apt install python-is-python3
sudo apt install pipx
pipx ensurepath

3. Install pyOCD

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pipx install pyocd

4. Verify probe detection

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pyocd list

Common Usage

List targets

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pyocd list --targets

Flash firmware

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pyocd load firmware.elf

Open GDB server

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pyocd gdbserver

Troubleshooting

• If pyocd list shows no probe, check USB permission/udev rules.
• If J-Link appears but target connection fails, verify SWD wiring and target power.
• Try lower SWD clock when signal quality is poor.